Direction: all of the numbers represent different directions (one is velocity), so if you enter all three, it's gonna go out the corner. Try combinations using two of the first three.
Button = Rocket: alright, wrench event basics.
Input Event: onActivate - when you click it, it'll trigger the event.
Target: self - the brick that you click is shooting the projectile
Output Event: spawnProjectile - after the onActivate, you wanna make a rocket
Other Parameters: i dunno about spawnProjectile (haven't used much), but I think you'd want the Gravity Rocket and then you have the direction stuff.